/*
 * Copyright (C) 2016~2024 dinstone<dinstone@163.com>
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package com.dinstone.grape.redis;

import java.util.UUID;

/**
 * permit lock based on redis. If permit is not acquired, do not wait.
 *
 * @author dinstone
 */
public class RedisLock {

    private final RedisClient redisClient;

    private final long lockTimeout;

    private final String lockKey;

    private final String lockValue = UUID.randomUUID().toString();

    public RedisLock(RedisClient redisClient, String lockKey, long lockTimeout) {
        if (redisClient == null) {
            throw new IllegalArgumentException("jedisPool is null");
        }
        if (lockKey == null || lockKey.isEmpty()) {
            throw new IllegalArgumentException("lockKey is empty");
        }

        this.redisClient = redisClient;
        this.lockKey = lockKey;
        this.lockTimeout = lockTimeout;
    }

    public boolean acquire() {
        return redisClient.setNxEx(lockKey, lockValue, lockTimeout);
    }

    public boolean release() {
        if (lockValue.equals(redisClient.get(lockKey))) {
            redisClient.del(lockKey);
            return true;
        }
        return false;
    }

}
